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BAR-056

BACHELOR OF ARCHITECTURE (B.Arch.) Term-End Examination December, 2014

00320

BAR-056 : TOPOGRAPHIC SYSTEMS Time : 3 hours

Maximum Marks : 70

Note : Attempt any five questions. All questions carry equal marks. 1.

2.

(a)

Classify the survey on the basis of equipment used. Define the terms used.

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(b) Calculate the sag correction for a 30 m steel tape under a pull of 100 N in three equal spans of 10 m each. Weight of steel is 0.078 N/cm3. Area of cross-section of the tape is 0.08 cm2.

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(a) Explain the functions of cross staff and optical square.

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(b) In passing an obstacle in the form of a pond, stations A and D, on the main line were taken on the opposite side of the pond. On the left of AD, a line AB, 200 m long was laid down and a second line AC, 250 m long was ranged on the right of AD, the points B, D and C being in the same straight line. BD and DC were then chained and found to be 125 and 150 m, respectively. Find the length of AD.

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P.T.O.

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(a) Explain the permanent adjustment of surveyor's compass.

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(b) What is magnetic declination ? Discuss the factors affecting it.

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The following bearings were observed in running a closed traverse : Line

FB

BB

AB

75. 5'

254° 20'

BC

115° 20'

296° 35'

CD

165° 35'

345° 35'

DE

224° 50'

44° 5'

EA

304° 50'

125° 5'

Which station is affected by local attraction ? Determine the correct magnetic bearings. If the declination was 5° 10' E, what are the true bearings ?

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(a) Describe in brief the essential difference between a Dumpy level and a Tilting level.

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(b) If the bubble tube of a level has a sensitiveness of 35" per 2 mm division, find the error in the staff reading on a vertical staff at a distance of 100 m.

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(a) Describe with neat sketches, the characteristics of contours.

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(b) Explain any two uses of contour maps.

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7. (a) What are the factors affecting degree of precision of levelling ? Explain in detail.

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(b) Discuss the difficulties faced during levelling in the following cases :

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(i) Steep slope (ii) Summits and hollows

8.

Write short notes on any four of the following : 4x3 1=14 2

(a) Merits and demerits of rise and fall method (b) Reciprocal levelling (c) Instruments used for plane table surveying (d) Swing offset and oblique offset (e) Errors in compass survey (f) Temperature correction for tape

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